HDFS-16635.Fixed javadoc error in Java 11 (#4451)

Co-authored-by: Ashutosh Gupta <ashugpt@amazon.com>

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/package-info.java

@@ -17,7 +17,7 @@
  */
 
 /**
- * This package provides a mechanism for tracking {@link NameNode} startup
+ * This package provides a mechanism for tracking NameNode startup
  * progress.  The package models NameNode startup as a series of {@link Phase}s,
  * with each phase further sub-divided into multiple {@link Step}s.  All phases
  * are coarse-grained and typically known in advance, implied by the structure of